6.2 Winch brakes shall be of robust construction and afford complete control and limitation of speed in the operation of lowering. The hand brake shall be so arranged that it is normally in the “ON” position and returns to the “ON” position when the control handle is not being operated. The mass of the brake lever shall be sufficient to operate the brake effectively without additional pressure. The winch brakes of a launching appliance shall be of sufficient strength to withstand:
6.2.1 a static load test with a proof load of not less than 1.5 times the maximum working load; and
6.2.2 a dynamic test with a proof load of not less than 1.1 times the maximum working load at the maximum lowering speed.